[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH V3 1/2] x86/altp2m: Add hypercall to set a range of sve bits
By default the sve bits are not set. This patch adds a new hypercall, xc_altp2m_set_supress_ve_multi(), to set a range of sve bits. The core function, p2m_set_suppress_ve_multi(), does not brake in case of a error and it is doing a best effort for setting the bits in the given range. A check for continuation is made in order to have preemption on big ranges. Signed-off-by: Alexandru Isaila <aisaila@xxxxxxxxxxxxxxx> --- CC: Ian Jackson <ian.jackson@xxxxxxxxxxxxx> CC: Wei Liu <wl@xxxxxxx> CC: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> CC: George Dunlap <George.Dunlap@xxxxxxxxxxxxx> CC: Jan Beulich <jbeulich@xxxxxxxx> CC: Julien Grall <julien@xxxxxxx> CC: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> CC: Stefano Stabellini <sstabellini@xxxxxxxxxx> CC: "Roger Pau Monné" <roger.pau@xxxxxxxxxx> CC: George Dunlap <george.dunlap@xxxxxxxxxxxxx> CC: Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx> CC: Tamas K Lengyel <tamas@xxxxxxxxxxxxx> CC: Petre Pircalabu <ppircalabu@xxxxxxxxxxxxxxx> --- Changes since V2: - Add a new structure "xen_hvm_altp2m_suppress_ve_multi" - Copy the gfn of the first error to the caller - Revert xen_hvm_altp2m_suppress_ve - Add a mechanism to save the first error. --- tools/libxc/include/xenctrl.h | 4 +++ tools/libxc/xc_altp2m.c | 30 +++++++++++++++++ xen/arch/x86/hvm/hvm.c | 13 +++++++ xen/arch/x86/mm/p2m.c | 60 +++++++++++++++++++++++++++++++++ xen/include/public/hvm/hvm_op.h | 14 ++++++++ xen/include/xen/mem_access.h | 3 ++ 6 files changed, 124 insertions(+) diff --git a/tools/libxc/include/xenctrl.h b/tools/libxc/include/xenctrl.h index f4431687b3..356533e391 100644 --- a/tools/libxc/include/xenctrl.h +++ b/tools/libxc/include/xenctrl.h @@ -1923,6 +1923,10 @@ int xc_altp2m_switch_to_view(xc_interface *handle, uint32_t domid, uint16_t view_id); int xc_altp2m_set_suppress_ve(xc_interface *handle, uint32_t domid, uint16_t view_id, xen_pfn_t gfn, bool sve); +int xc_altp2m_set_supress_ve_multi(xc_interface *handle, uint32_t domid, + uint16_t view_id, xen_pfn_t first_gfn, + xen_pfn_t last_gfn, bool sve, + xen_pfn_t *error); int xc_altp2m_get_suppress_ve(xc_interface *handle, uint32_t domid, uint16_t view_id, xen_pfn_t gfn, bool *sve); int xc_altp2m_set_mem_access(xc_interface *handle, uint32_t domid, diff --git a/tools/libxc/xc_altp2m.c b/tools/libxc/xc_altp2m.c index 09dad0355e..03bd651a61 100644 --- a/tools/libxc/xc_altp2m.c +++ b/tools/libxc/xc_altp2m.c @@ -234,6 +234,36 @@ int xc_altp2m_set_suppress_ve(xc_interface *handle, uint32_t domid, return rc; } +int xc_altp2m_set_supress_ve_multi(xc_interface *handle, uint32_t domid, + uint16_t view_id, xen_pfn_t first_gfn, + xen_pfn_t last_gfn, bool sve, + xen_pfn_t *error) +{ + int rc; + DECLARE_HYPERCALL_BUFFER(xen_hvm_altp2m_op_t, arg); + + arg = xc_hypercall_buffer_alloc(handle, arg, sizeof(*arg)); + if ( arg == NULL ) + return -1; + + arg->version = HVMOP_ALTP2M_INTERFACE_VERSION; + arg->cmd = HVMOP_altp2m_set_suppress_ve_multi; + arg->domain = domid; + arg->u.suppress_ve_multi.view = view_id; + arg->u.suppress_ve_multi.first_gfn = first_gfn; + arg->u.suppress_ve_multi.last_gfn = last_gfn; + arg->u.suppress_ve_multi.suppress_ve = sve; + + rc = xencall2(handle->xcall, __HYPERVISOR_hvm_op, HVMOP_altp2m, + HYPERCALL_BUFFER_AS_ARG(arg)); + + if ( arg->u.suppress_ve_multi.first_error ) + *error = arg->u.suppress_ve_multi.first_error; + + xc_hypercall_buffer_free(handle, arg); + return rc; +} + int xc_altp2m_set_mem_access(xc_interface *handle, uint32_t domid, uint16_t view_id, xen_pfn_t gfn, xenmem_access_t access) diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c index 818e705fd1..8a2d4325f9 100644 --- a/xen/arch/x86/hvm/hvm.c +++ b/xen/arch/x86/hvm/hvm.c @@ -4553,6 +4553,7 @@ static int do_altp2m_op( case HVMOP_altp2m_destroy_p2m: case HVMOP_altp2m_switch_p2m: case HVMOP_altp2m_set_suppress_ve: + case HVMOP_altp2m_set_suppress_ve_multi: case HVMOP_altp2m_get_suppress_ve: case HVMOP_altp2m_set_mem_access: case HVMOP_altp2m_set_mem_access_multi: @@ -4711,6 +4712,18 @@ static int do_altp2m_op( } break; + case HVMOP_altp2m_set_suppress_ve_multi: + if ( a.u.suppress_ve_multi.pad1 || !a.u.suppress_ve_multi.pad2 ) + rc = -EINVAL; + else + { + rc = p2m_set_suppress_ve_multi(d, &a.u.suppress_ve_multi); + + if ( __copy_to_guest(arg, &a, 1) ) + rc = -EFAULT; + } + break; + case HVMOP_altp2m_get_suppress_ve: if ( a.u.suppress_ve.pad1 || a.u.suppress_ve.pad2 ) rc = -EINVAL; diff --git a/xen/arch/x86/mm/p2m.c b/xen/arch/x86/mm/p2m.c index ba126f790a..2b51a7f50f 100644 --- a/xen/arch/x86/mm/p2m.c +++ b/xen/arch/x86/mm/p2m.c @@ -3059,6 +3059,66 @@ out: return rc; } +/* + * Set/clear the #VE suppress bit for multiple pages. Only available on VMX. + */ +int p2m_set_suppress_ve_multi(struct domain *d, + struct xen_hvm_altp2m_suppress_ve_multi *sve) +{ + struct p2m_domain *host_p2m = p2m_get_hostp2m(d); + struct p2m_domain *ap2m = NULL; + struct p2m_domain *p2m; + uint64_t start = sve->opaque ?: sve->first_gfn; + int rc = 0; + + if ( sve->view > 0 ) + { + if ( sve->view >= MAX_ALTP2M || + d->arch.altp2m_eptp[sve->view] == mfn_x(INVALID_MFN) ) + return -EINVAL; + + p2m = ap2m = d->arch.altp2m_p2m[sve->view]; + } + else + p2m = host_p2m; + + p2m_lock(host_p2m); + + if ( ap2m ) + p2m_lock(ap2m); + + + while ( sve->last_gfn >= start ) + { + p2m_access_t a; + p2m_type_t t; + mfn_t mfn; + + if ( altp2m_get_effective_entry(p2m, _gfn(start), &mfn, &t, &a, AP2MGET_query) ) + a = p2m->default_access; + + if ( p2m->set_entry(p2m, _gfn(start), mfn, PAGE_ORDER_4K, t, a, + sve->suppress_ve) && !sve->first_error ) + sve->first_error = start; /* Save the gfn from of the first error */ + + /* Check for continuation if it's not the last iteration. */ + if ( sve->last_gfn >= ++start && hypercall_preempt_check() ) + { + rc = -ERESTART; + break; + } + } + + sve->opaque = start; + + if ( ap2m ) + p2m_unlock(ap2m); + + p2m_unlock(host_p2m); + + return rc; +} + int p2m_get_suppress_ve(struct domain *d, gfn_t gfn, bool *suppress_ve, unsigned int altp2m_idx) { diff --git a/xen/include/public/hvm/hvm_op.h b/xen/include/public/hvm/hvm_op.h index 353f8034d9..10ba0149f1 100644 --- a/xen/include/public/hvm/hvm_op.h +++ b/xen/include/public/hvm/hvm_op.h @@ -46,6 +46,17 @@ struct xen_hvm_altp2m_suppress_ve { uint64_t gfn; }; +struct xen_hvm_altp2m_suppress_ve_multi { + uint16_t view; + uint8_t suppress_ve; /* Boolean type. */ + uint8_t pad1; + uint32_t pad2; + uint64_t first_gfn; + uint64_t last_gfn; + uint64_t opaque; + uint64_t first_error; /* Gfn of the first error. */ +}; + #if __XEN_INTERFACE_VERSION__ < 0x00040900 /* Set the logical level of one of a domain's PCI INTx wires. */ @@ -339,6 +350,8 @@ struct xen_hvm_altp2m_op { #define HVMOP_altp2m_vcpu_disable_notify 13 /* Get the active vcpu p2m index */ #define HVMOP_altp2m_get_p2m_idx 14 +/* Set the "Supress #VE" bit for a range of pages */ +#define HVMOP_altp2m_set_suppress_ve_multi 15 domid_t domain; uint16_t pad1; uint32_t pad2; @@ -353,6 +366,7 @@ struct xen_hvm_altp2m_op { struct xen_hvm_altp2m_change_gfn change_gfn; struct xen_hvm_altp2m_set_mem_access_multi set_mem_access_multi; struct xen_hvm_altp2m_suppress_ve suppress_ve; + struct xen_hvm_altp2m_suppress_ve_multi suppress_ve_multi; struct xen_hvm_altp2m_vcpu_disable_notify disable_notify; struct xen_hvm_altp2m_get_vcpu_p2m_idx get_vcpu_p2m_idx; uint8_t pad[64]; diff --git a/xen/include/xen/mem_access.h b/xen/include/xen/mem_access.h index e4d24502e0..00e594a0ad 100644 --- a/xen/include/xen/mem_access.h +++ b/xen/include/xen/mem_access.h @@ -75,6 +75,9 @@ long p2m_set_mem_access_multi(struct domain *d, int p2m_set_suppress_ve(struct domain *d, gfn_t gfn, bool suppress_ve, unsigned int altp2m_idx); +int p2m_set_suppress_ve_multi(struct domain *d, + struct xen_hvm_altp2m_suppress_ve_multi *suppress_ve); + int p2m_get_suppress_ve(struct domain *d, gfn_t gfn, bool *suppress_ve, unsigned int altp2m_idx); -- 2.17.1 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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